Overburden and Surface Movement Mechanism of High Intensity Repeated Mining
In order to provide theoretical and technical support for ecological restoration and the mining of coal under buildings,railroads and water bodies,in large coal production bases such as Shendong coal mining area,the characteristics and mechanism of surface movement in high-intensity repetitive mining were deeply studied based on the field observation method.Firstly,surface movement observation lines are set for mining under old goaf,mining under coal pillar,mining under old goaf and coal pillar.Rapid and intensive monitoring is carried out to collect abundant surface movement data.Then,the subsidence and horizontal movement values in different periods were obtained through data analysis,and the time series of surface move-ment curve was drawn.Through curve analysis,it is found that coal pillar has the characteristics of hindrance,driving and acti-vation to the development process of surface subsidence.The driving relationship between the advancing process and the shape of the horizontal movement curve had been found:the direction of the horizontal movement follows advancing direction of the working face.Finally,the block rock structure model under the condition of high intensity repeated mining is established,and the movement process of the block-rock mass in the process of underground advancing is analyzed.The mechanism of rock stra-ta movement behind the measured curve of surface movement is revealed.The study results can provide technical support for the establishment of mining subsidence prediction model and ecological environment restoration and management in this mining area or similar mining areas.
mining subsidencerepeated miningcoal pillarssurface movement characteristicsblock rock structure
NETL
NSTL
万方数据
